<?php
    namespace Library;

    class Date
    {
        public function relative($timestamp)
        {
            if(!ctype_digit($timestamp))
            {
                $timestamp = strtotime($timestamp);
            }

            $diff = time() - $timestamp;
            if($diff == 0)
            {
                return 'now';
            }
            elseif($diff > 0)
            {
                $day_diff = floor($diff / 86400);
                if($day_diff == 0)
                {
                    if($diff < 60) return 'just now';
                    if($diff < 120) return '1 minute ago';
                    if($diff < 3600) return floor($diff / 60) . ' minutes ago';
                    if($diff < 7200) return '1 hour ago';
                    if($diff < 86400) return floor($diff / 3600) . ' hours ago';
                }
                if($day_diff == 1) return 'yesterday';
                if($day_diff < 7) return $day_diff . ' days ago';
                if($day_diff < 31) return ceil($day_diff / 7) . ' weeks ago';
                if($day_diff < 60) return 'last month';
                return date('F Y', $timestamp);
            }
            else
            {
                $diff = abs($diff);
                $day_diff = floor($diff / 86400);
                if($day_diff == 0)
                {
                    if($diff < 120) return 'in a minute';
                    if($diff < 3600) return 'in ' . floor($diff / 60) . ' minutes';
                    if($diff < 7200) return 'in an hour';
                    if($diff < 86400) return 'in ' . floor($diff / 3600) . ' hours';
                }
                if($day_diff == 1) return 'tomorrow';
                if($day_diff < 4) return date('l', $timestamp);
                if($day_diff < 7 + (7 - date('w'))) return 'next week';
                if(ceil($day_diff / 7) < 4) return 'in ' . ceil($day_diff / 7) . ' weeks';
                if(date('n', $timestamp) == date('n') + 1) return 'next month';
                return date('F Y', $timestamp);
            }
        }
    }

?>
